Pressure device for leather-skiving machines.



G. 11.13AYLEY & B. F. MAYO. PRESSURE DEVICE POR LEATHER SKIVINGMACHINES.

APPLIUATION FILED SEPTZS, 1907.

Patented N0v.15,1910.

CHARLES H. IBAYLEY, OIE' BOSTON, AND BENJAMIN F. MAYO, 0F SALEM,MASSACHU- SETTS, ASSIGNORS TO UNITED SHOE MACHINERY COMPANY, OFPATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PRESSURE DEVICE FOR LEATHER-SKIVING MACHINES.

Specification of Letters Patent.

Patented Nov. 15, 1910.

Application filed September 23, 1907. Serial No. 394,084.

' ing Machines; and we do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to an improved pressure device for leatherskiving machines and is intended primarily for use in machines forskiving articles of leather such as boot and shoe counters, box toepieces and the like of the type disclosed in U. S. Patent No. 760,082,dated May 17, 1904. It is to be understood, however, that while theinvention is particularly adapted for use in machines of the classdisclosed in said patent, the invention is also applicable to otherforms of leather skiving machines.

In the machine of the patent above referred to the pressure deviceconsists of a pressure roller which is provided with a yielding surfaceof rubber in order that the ingly supported carriers and rotated byVleather blank may be firmly seated against the bottom of the die cavityin the die roller and held securely therein while the blank is beingforced against the skiving knife. This roller gives satisfactory resultswith many grades of stock. With certain grades of stock however, andparticularly with hard and dry stock the pressure roller sometimes failsto hold a blank in position in the die cavity while it is being forcedagainst the skiving knife, so that the blank is improperly skived. Alsowith these grades of stock the surface of the pressure roller is oftencut and injured and rapidly deteriorates.

The object of the present invention is t0 rovide a pressure device whichwill be free rom the objections above noted, which will be simple andcompact in construction and which will operate upon hard and dry stockin a satisfactory manner.

With this object in view the present invention contemplates theprovision of a pressure device comprising a series of metallic pressuredisks journaled in separate yieldmeans of a shaft passing through thedisks and connected thereto so that the disks are rotated by the shaftand at the same time are permitted to move transversely to the shaft.The disks are arranged in close proximity to each other so as toconstitute in effect a roll, the peripheral surface of which, being ofmetal, is practically indestructible, and

.which if desired can be provided with corrugations or teeth so that aleather blank can be positively engaged by the roll and forced againstthe cutting edge of the skiving knife without any liability ofdisplacement. The provision of a plurality of spring pressed disks whichare movable transversely of the pressure roll shaft permits the surfaceof the roll in contact with the blank to yield so that the blank can beforced into a die cavity in substantially the same manner as when arubber covered roll is used. The journals of the disks hold the disks inposition independently of the shaft and the disks are thereby preventedfrom being displaced with relation to each other except as suchdisplacement is produced by the relative movements of the carriers. Iheroll therefore can be used in the same relation to the skiving knife andother parts of a leather skiving machine as a rubber covered roll.peripheral surface of the disks is preferably corrugated or toothed andin order to strip the skiving from the disks, strippers are preferablyprovided between adjacent disks and these strippers are preferably soarranged as to limit the penetration of the teeth into the blank. In thepreferred form of the invention hereinafter described the strippersconsist of strips of metal which are mounted so as to yield to permitthe teeth of the disks to penetrate the blank and means are provided foradjusting the strippers to vary the position of their work engagingsurlfaces with relation to the teeth of the dis is.

In the preferred form ofthe present in-k vention, certain novelconstructions and arrangements of parts are provided which arehereinafter described and claimed. The advantages of these constructionswill be apparent to those skilled in the art from the followingdescription of the preferred form of the several features of the presentinvention.

In the drawing accompanying this appli- The cation Figure 1 is alongitudinal sectional view of a portion of a leather skiving machineembodying the several features of the present invention in theirpreferred form. Fig. 2 is a view in rear elevation of the partsillustrated in Fig. l. Fig. 8 is a detail view in side elevation of oneof the metal. pressure disks. Fig. t is an edge view of the diskillustrated in Fig. 3. Figs. 5 and 6 are respectively a side and an edgeview of a bushing which is used to mount a pressure disk in its carrier.Fig. 7 is a view in side elevation of the upper end of one of the diskcarriers, and Fig. 8 is a sectional view of the upper end of one of thedisk carriers with a disk mounted therein, the section being taken onthe line 8-8 of Fig. 7.

In the drawing 1 indicates the die roller of a leather skiving machinefor skiving counter or box toe blanks, 2 the die roll shaft, 3 thepressure roll shaft, l the skiving knife, 5 the bed plate of the blanksupport-ing hopper, 6 the front wall of the hopper and 7 the guard plateat the lower end of the front wall of the hopper, said parts beingconstructed and arranged to operate in the manner fully described inPatent No. 760,082, hereinbefore referred to.

The improved pressure device illustrated in the drawings comprises aseries of metallic disks 8 each of which is mounted in the upper end ofa spring supported slide 9. Each slide is provided with a cylindricalstem by means of which it is mounted in a crossbar 10 secured to theframe of the machine, and with a head above the cylindrical stemsuitably bored and slotted to receive the pressure disk. Each disk isjournaled in the head of a slide by.means of a bushing 11 which closelyfits the internal surface of the disk and which is wider than the diskso as to engage bearing surfaces in the head of the slide as clearlyillustrated in Fig. 8. In mounting a disk in a slide the disk is firstplaced in position in the slot which is cut in the slide to receive itand then the bushing is inserted endwise through-the bearings in theslide and through the disk. The bushing and disk are then securedtogether by means of a key 12 (see Fig. 8) which is passed throughnotches 13 in the slide and engages recesses 14 and 15 in the bushingand disk. Vhen the bushing and disk are in position in the slide, thebushing and disk can rotatefreely but are held against axial movement bythe sides of the slot in the slide which receives the disk. 1 Thecylindrical stems of the slides are received in cylindrical guidewaysbored in the cross bar 10, and to enable the stems to be arranged closetogether and still be of the desired size, the guideways for the stemsare arranged in two rows as indicated in Fig. 1. Each slide isyieldingly supported by means of a coiled spring 16 which is seated in arecess in the stem of the slide and bears against a block 17. To enablethe pressure of the springs to be varied das desired, each block 17 ismounted upon an adjusting screw 18 and is held against rotation with thescrew by means of a projection19 engaging a longitudinal slot in thestem of the slide. The

screws 18 are mounted in the cross bar 10 and are provided below thecross bar with squared portionsby means of which they can beconveniently turned to adjust the tension of theV springs 16. The upwardmovement of the slides under the influence of the springs 16 is limitedby adjustable stops 2O which are actuated by a series of adjust-ingscrews 21.

By the construction so far described the pressure disks 8 are held inposition to act upon a blank passing between the disks and the die roll,and are allowed to move with relation to each other so as to forcetheblank into the die cavity. The pressure roll shaft 8 passes throughall of the disks, and to cause the disks to be rotated by the shaft andat the same time permit the disks to move transversely of the shaftindependently of each other, the openings in the bushings 11 throughwhich the shaft passes are considerably larger than the shaft, and theshaft and bushings are provided respectively with a rib 22 and withnotches 23, said rib and notches constituting means for connecting theshaft and disks to cause the disks to be positively rotated by theshaft.

To insure the removal ofthe skiving from the disks, strippers areprovided, which, as illustrated, consist of curved metal strips 24extending over the disk carriers and between the disks. At their forwardends these strippers are pivotally mounted at 25 in a bar 26 secured tothe bottom plate 5 of the hopper for the blanks, and at their rear endsthe strippers rest upon pins 27. Each pin 27 extends into a recess inthe cross bar 10 and is acted upon by a coiled spring 28 seated in therecessl and bearing against a block 29 having a screw-threadedengagement with the pin. The outward movement of the pin is limited bythe screwthreaded sleeve 30, and by rot-ating this sleeve the positionof the pin can be adjusted and consequently the position of the workengaging surface of the strippers resting on the pm with relation to theteeth of the pressure disks. Each block 29 is held from rotation bymeans of a projection 31 engaging a slot 32, and by rotating the pin,the pin can be adjusted independently of the sleeve 30. By rotating boththe sleeve 80 and the pin27 the tension of the spring 28 can be adjustedas desired without changing the position of the pin.

The operation of the pressure device illustrated in the drawing has beenindicated in connection with the description given above Y combination,

of the construction and arrangement of its various parts and will bereadily understood by those skilled in the art without a separatedescription thereof.

The nature and scope of the present invention having been indicated, andthe preferred form of the invention having been specifically described,what is claimed is 1. A pressure device for leather skiving machines,having, in combination, a series of pressure disks, a separate carrierfor each disk in which the disk is journaled, a rotary shaft passingthrough the disks, connections between the shaft and disks for rotatingthe disks while permitting the disks to move transversely to the shaft,and means for yieldingly supporting the disks.

2. A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a separate carrier for eachdisk in which the disk in ournaled, a rotary shaft passing through thedisks, connections between the shaft and disks for rotating the diskswhile permitting the disks to move transversely to the shaft, a separatespring supporting each carrier, and means for adjusting the tension ofthe springs independently.

3. A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a separate carrier for eachdisk in which the disk is journaled, a rotary shaft passing through thedisks, connections between the shaft and disks for rotating the diskswhile permittin the disks to move transversely to the sha t, springssupporting the carriers, and adjustable stops to limit the movement ofthe carriers.

4. A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a separate slide for each diskprovided with a head in which the disk is journaled and a guiding stem,means for yieldingly supporting the slides, a rotary shaft passingthrough the disks, and connections between the shaft and disks forrotating the disks while permitting the disks to move transversely tothe shaft.

5. A leather skiving machine, having, in

a skiving knife, a series of pressure disks, a device coperatingtherewith to hold the work in position to be acted upon by the skivingknife, and a series of strippers located between the disks 1n positionto remove a skiving from the disks, said strippers being arranged toyieldradially of the disks and extending between the disks and the saidcoperating device.

6. A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a series of strippers locatedbetween the disks in position to remove a skiving from the disks, andmeans for adjusting the strippers with relation to the peripheralsurface of the disks.

7 A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a series of strippers locatedbetween the disks in position to remove a skiving from the disks, aseparate spring supporting each stripper, and means for adjusting thetension of the springs independently.

8. A pressure device for leather skiving machines, having, incombination, a series of pressure disks, a series of strippers locatedbetween the disks in position to remove a skiving from the disks, meansfor pivotally supporting the strippers at one end, and a series ofspring-pressed pins for supporting the other ends of the strippers.

9. A leather skiving machine, having, in combination, a series ofpressure disks, a series of independently movable slides in which thedisks are journaled arranged side by side in Contact with each other,means for yieldingly supporting the slides, a rotary shaft passingthrough the disks, and connections between the shaft and disks forrotating the disks while permitting the disks to move transversely tothe shaft.

n testimony whereof we aiiiX our signatures, in presence of twowitnesses'.

CHARLES H. BAYLEY. BENJAMIN E. MAYO.

Witnesses:

EDITH C. HoLBRooK, FREDERICK L. EDMANDS.

